Question

What will be the value of a8 -a4, for the
AP 4, 9, 14, ... 254.♀️♀️♀️​

Answer 1

Answer:

a = 4

a8 - a4 = 4(8) - 4 (4)

= 32 - 16

= 16

Answer 2

Answer:20

Step-by-step explanation:

A.P. is 4,9,14

First term =4 ,let 4=a1=first term

9=a2 14 =a3

Then,

We are given that this is an A.P.

So, d = a2 - a1 =9 - 4 = 5

By the formula,

a of n = first term +(n - 1)d,

So,

a8 = 4+(8 - 1) × 5

a8 = 4+ 7×5

a8 = 4+35 =39

By the same formula,

a4 = 4 +(4 - 1)x5

a4 = 4+ 3×5

a4 = 4+ 15

a4 = 19,

Hence, a8 - a4 = 39 - 19 =20